Iran's top negotiator warns the US of an "endless quagmire that you will be stuck in for years", after more threats from Donald Trump
Trump says the US will hit Iran "very hard" tonight, and vows to "assume total control" of Iran's oil and gas markets in the "not too distant future"
But Mohammad Bagher Ghalibaf says "wrong strategies and impulsive decisions" will "reset the entire board for the worse"
Trump also said "we will be taking Kharg Island" – a major oil terminal off the coast of Iran – but later raised doubts over whether the US "has the stomach" to seize it
It comes after India confirmed three sailors were killed in a US strike on a ship – the Settebello – near Oman on Wednesday. The US has also confirmed it attacked two other ships – Jalveer and Marivex – in recent days
Edited by Matt Spivey
The EU's foreign policy chief has described renewed attacks on Gulf states as "unnacceptable" in a call with her Iranian counterpart Abbas Araghchi.
In a post on X, Kaja Kallas says "the resumed attacks on the Gulf countries and their critical infrastructure are unacceptable".
"A return to full-scale war would come at a tremendous cost to the entire region. The diplomatic route remains the best path out of this war."
Earlier Araghchi said he condemned US "aggression" in the phone call with Kallas, which took place this morning.
Araghchi said he told Kallas that recent US strikes were a "violation of international law" and rendered the ceasefire "ineffective".
Iran's top joint military command warns the US will receive a response "more severe than before" if it tries to carry out further attacks against Iran.
It says the US talks about a deal but then commits acts of aggression, which it calls a "blatant contradiction".
US President Donald Trump said earlier the US will hit Iran "very hard" tonight, and vowed to "assume total control" of Iran's oil and gas markets in the "not too distant future".
Following Trump's threats, Iran's top military command warns "either oil and gas exports are for everyone or they will be for no one".
UN Secretary-General Antonio Guterres is "deeply concerned" by the continuing escalation in the Middle East, including both US and Iranian strikes, his spokesperson says.
Guterres urges the parties to return to a "full implementation of the ceasefire" and to uphold obligations under international law to protect civilians.
His spokesperson adds that he calls on the US and Iran to "redouble efforts towards a peaceful, comprehensive and durable agreement" for regional and international peace.
Parliamentary Speaker Mohammad Bagher Ghalibaf has warned against 'impulsive decisions'
A senior Iranian official has warned the US against being sucked into an "endless quagmire".
Mohammad Bagher Ghalibaf, Iran's parliamentary speaker and chief negotiator, says in a post on X that "wrong strategies and impulsive decisions will reset the entire board for the worse".
He says these decisions could "explode energy infrastructure and markets", creating an "endless quagmire that you will be stuck in for years".
"You will see a different Iran," he concludes.
It comes after threats by US President Donald Trump to hit Iran "very hard tonight" and seize Kharg Island.
A firefighter works in the aftermath of Iranian drone attacks in Bahrain
Any damage caused by Iran against US allies will be paid for by funds "extracted from Iranian accounts", US Treasury Secretary Scott Bessent says.
In a post on X, Bessent says any tolls paid to the Persian Gulf Strait Authority – a new body set up by Iran to control the Strait of Hormuz – "will be offset by [Iranian] funds".
He continues: "Every attack Iran launches will only deepen the economic and financial consequences it faces."
Earlier today, Iran lauched a series of attacks against US assets in Jordan, Bahrain and Kuwait. This came after a series of US strikes in southern Iran. 
Frank Gardner
Security correspondent
Around 90% of Iran's oil exports pass through Kharg Island
If the US does decide to invade Kharg Island then it would most likely be a temporary measure intended to put pressure on Iran by cutting off its fuel exports until it relinquished its chokehold on the Strait of Hormuz – one of the world's busiest oil shipping lanes – and conceded to Washington's demands.
Given the resilience and defiance of the Iranian regime it is highly questionable whether this would work. Iran is believed to have reinforced its defences on the island, including with surface-to-air missile batteries.
In theory, US paratroopers could make an airborne assault, probably at night, to seize key positions on this small island, which measures just 20 sq km (7.7 sq miles).
The US Marines would deploy from ships equipped with Osprey tilt-rotor aircraft and Landing Craft Air Cushioned (LCAC) for making amphibious landings. But first those ships would have to run the gauntlet of getting through the Iranian-controlled Strait of Hormuz and then sailing all the way up the Gulf past any number of hidden Iranian drone and missile launch sites.
Any landing, by air or sea, would expect to be met with anti-personnel mines and swarms of drones. Such is the awesome fighting power of these Marine Expeditionary Units (MEUs) that the US force would almost certainly prevail, but it could come at the expense of a severe number of casualties.
The US then has the problem of holding the ground, for an indeterminate period, while subject to bombardment from the Iranian mainland.
You can read a longer version of this analysis on Kharg Island, which was published in March, here.
A negotiating team from Qatar held meetings in the Iranian capital Tehran into the early hours of this morning, according to reports.
A Qatari official tells the BBC’s US news partner CBS News that the negotiating team has since returned to Doha as diplomatic efforts continue.
Qatar has condemned Iranian attacks on Jordan, Bahrain and Kuwait, which came after US strikes in Iran. It has served as a mediator between the US and Iran, and called for work towards de-escalation.
A spokesman for Pakistan’s foreign ministry also told reporters earlier today that the country’s interior minister had held “important meetings” with senior leaders in Iran this week.
Tom Bateman
US State Department correspondent
Trump’s vow to “take” Kharg Island will reignite the fevered speculation during the war itself that a US ground operation could be imminent.
It will also spark furious denunciations in Tehran.
As ever with Trump, it’s impossible to know if it’s a genuine plan or bluster aimed at bullying his adversaries into capitulation.
We do know that the US 82nd Airborne Division remains in the region because US Central Command referenced their involvement in this week’s rescue of an Apache helicopter crew.
Such an airborne elite infantry unit could be an essential component to any land-based operation.
But within a few minutes of his social media post, Trump appeared on Fox News seeming to contradict the more definitive tone of his earlier statement.
He said, instead, that his “preference” had always been “to take Kharg Island” which he said could make a “fortune” for the US (meaning in oil revenues), but that he doubted the American people had “the stomach for it” – whilst also saying he "does not want to have to put boots on the ground".
We can now bring you more comments from US President Donald Trump, who has been speaking to American media outlets about the war in Iran.
He tells Fox News that the US "dropped $250m (£187m) worth of bombs" on Iran last night and reiterates his threat to take Kharg Island.
But he raises doubts about whether the US "has the stomach" to engage in such a military operation.
"I'm not sure the country has the appetite for it, as good as it is," he says on a phone call.
Nabiha Ahmed
Live reporter
A vessel in the Strait of Hormuz earlier today
In his latest threat of escalation, Donald Trump has said the US will hit Iran "very hard" tonight.
The US president has threatened to "assume total control" of Iran's oil and gas markets, and seize Kharg Island in the "not too distant future". Why is Kharg Island important?
His comments come after the US Central Command confirmed it had struck a third ship in the Gulf of Oman this week, claiming the Guinea-Bissau-flagged vessel Jalveer "violated" the US blockade of Iranian ports in the Strait of Hormuz.
Earlier, an Indian official confirmed three Indian sailors had been killed in a "deeply unfortunate" US strike on the Palau-flagged Settebello off the coast of Oman. "Everything was alright when we last spoke," says a father of one of the deceased sailors.
Iran's foreign ministry says the US's actions render the ceasefire “practically meaningless”. Iran has been targeting US military assets across the Gulf region – local authorities say an 11-year-old girl was injured in an Iranian drone attack on Bahrain this morning.
Several countries – including Pakistan, Russia and China – have reiterated their calls for de-escalation between Iran and the US.
Sebastian Usher
Global affairs correspondent, reporting from Jerusalem
The US strategy right now appears to be to ratchet up its strikes on Iran day by day, without resuming all-out war. Iran has been responding in kind.
The country's foreign ministry has said that at this point the ceasefire has been rendered "practically meaningless".
Arab Gulf states are again being put back on the frontline of the conflict, as Iran has been trying to hit US military bases that they host.
In recent weeks, the Iranian regime appears to have been capitalising on Trump's reluctance to go back to war, but his mood may once again be changing.
Nevertheless, mediators from Qatar and Pakistan are still trying to nail down a deal.
The chances may be even slimmer now.
Jemma Crew
Business reporter
The price of oil rose by about $2 after US President Donald Trump promised to hit Iran "very hard" with fresh strikes, and take control of its oil and gas markets.
Brent crude futures increased to $94.16 a barrel in the space of a few minutes this afternoon, before falling back slightly.
"At some point in the not too distant future, we will be taking Kharg Island, and other oil infrastructure points, and assume total control of their Oil and Gas Markets, much like we have with Venezuela, which is working out brilliantly for both Venezuela and the United States of America," Trump wrote on Truth Social. You can read the post in full here.
Earlier on Thursday, the oil price had been on a downward tilt from a high of just over $95 just after 01:00 BST, to just under $92 by mid-morning in the UK.
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Why Trump wants to take Iran's Kharg Island
Explosions have been heard in the vicinity of the Iranian city Sirik, which borders the Strait of Hormuz, Iran's semi-official news agency Mehr reports.
The BBC has not independently verified this report, and neither the US nor Iran have commented directly on if strikes were carried out.
The island processes a huge amount of Iran's crude oil for export via pipes from the mainland
In his latest Truth Social post, Trump says he will be "taking" Kharg Island "at some point in the not too distant future".
He claims he will take control of their oil and gas markets, "much like we have with Venezuela".
The small island off the coast of Iran is home to a major oil terminal that is considered the country's economic lifeline.
On 13 March, the US launched strikes on Kharg, with Trump saying US forces had "totally obliterated" every military target there. It held off targeting the island's oil infrastructure, but the president warned of possible further American action.
Taking the island could choke off Iran's oil exports and provide a platform for the US military to carry out attacks against the mainland.
The US could use the island as leverage to compel the Iranians to keep the strait open.
But, analysts warn that it could be challenging and a US landing force would have to move considerable distances, either through naval vessels or airborne forces.
Chris Partridge
BBC News weapons analyst
US Central Command (Centcom) says one of its aircraft used two Hellfire missiles to disable the oil tanker in the Gulf of Oman yesterday.
The missiles were fired into the engine room of the Guinea-Bissau flagged Jalveer vessel, Centcom says. US military authorities say the crew repeatedly failed to comply with directions from US forces as the ship tried to transport oil from Iran.
Hellfire missiles – or AGM-114s to give them their official designation – are carried by both US military drones and US Army Apache helicopters. They are often guided using semi-active laser technology for precision strikes.
The pilot locks a laser beam onto a target using a screen in the cockpit / control panel and the weapon flies to the point where the laser is striking. With a stated range of some 8km, even fast-moving targets can be engaged with Hellfire.
To date some nine vessels have been disabled as a blockade is enforced against any vessels entering or leaving Iranian ports.
Donald Trump says that the US will strike Iran "very hard tonight" in a new post on Truth Social.
Here's what the president says:
"The United States will be hitting Iran (Whose Navy, Air Force, Radar, Anti Aircraft, and all other forms of Defense, together with most of its offensive capability, are GONE!), VERY HARD TONIGHT
"At some point in the not too distant future, we will be taking Kharg Island, and other oil infrastructure points, and assume total control of their Oil and Gas Markets, much like we have with Venezuela, which is working out brilliantly for both Venezuela and the United States of America."
Since the beginning of the conflict, Trump has repeatedly threatened to seize Kharg Island, a small island off the coast of Iran that is home to a major oil terminal.
An 11-year-old girl was injured in an Iranian drone attack on Bahrain this morning, according to local authorities.
Iran's Islamic Revolutionary Guard Corps (IRGC) has confirmed it launched strikes against American bases in Bahrain, Kuwait and Jordan in response to US strikes in southern Iran.
Jordan says it shot down 20 Iranian missiles, while Kuwait's military says its military engaged "hostile aerial targets".
In Bahrain, which hosts a US naval base, homes and cars were damaged in an Iranian attack, authorities say.
The aftermath of an Iranian drone strike on Bahrain
Buildings in Bahrain, damaged by the strikes
By Shruti Menon
BBC Verify has been looking into what happened to the Settebello since reports it was attacked first emerged yesterday, before the US military confirmed it was responsible for the missile strike.
Settebello’s location tracker has been inactive since 31 May, data on ship-tracking website MarineTraffic shows, so it is not clear exactly where the vessel was when it was hit.
But we have seen the vessel in satellite imagery from 8 June in the Gulf of Oman, about 80 miles (120km) from port of Sohar in Oman.
India's shipping minister confirmed earlier that all three missing Indian crew members have been confirmed dead after their bodies were "located and identified".
Pakistan says it remains "deeply concerned" about the escalation of the conflict in the Middle East.
A foreign ministry spokesman says "diplomacy and dialogue should be the guiding principles" between the US and Iran, adding that Pakistan's Interior Minister Mohsin Naqvi held "important meetings" with senior leaders in Iran this week.
Meanwhile, India's foreign ministry has described repeated attacks on commercial vessels as "deeply worrisome" and called for an immediate de-escalation of tensions and continued negotiations.
Russia has also called on the US and Iran to restart peace talks, warning that new strikes would harm the world economy.
China has also said it is "seriously concerned" by the recent escalation, with a military spokesperson telling Reuters that resorting to force "will only further aggravate tensions and military action cannot resolve the underlying issues".
Turkey's Foreign Minister Hakan Fidan called for the US and Iran to halt their renewed attacks and resume negotiations.
Saudi Arabia’s foreign ministry has also called for de-escalation and for fresh negotiations to be mediated by Pakistan and Qatar.
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